KR20060124410A - Liquid crystal display device - Google Patents

Abstract

An LCD is provided to prevent the curling of an FPCB(Flexible Printed Circuit Board) due to change of surrounding temperature, by fixing the FPCB using a hook, which is coupled with a coupling hole of an upper container and inserted into a difference portion of a lower container. A backlight unit(200) supplies light to an LCD panel assembly(100). An upper container(230) contains the LCD panel assembly and the backlight assembly. At least one coupling hole(231) is formed in a sidewall of the upper container. A lower container(300) is coupled with the upper container, and has a step portion(310). An FPCB(130) is bent along a predetermined surface of the upper container. A hook(400) is coupled with the coupling hole of the upper container and inserted into the step portion of the lower container, thereby fixing the FPCB.

Description

Liquid crystal display device

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2A is a bottom perspective view illustrating a process in which a hook is coupled to a liquid crystal display device in which the liquid crystal panel assembly, the backlight unit, the upper accommodating container, and the lower accommodating container of FIG. 1 are assembled.

2B is a perspective view of a liquid crystal display device with a hook.

3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

4 is a cross-sectional view of a liquid crystal display according to another exemplary embodiment of the present invention.

5 is a perspective view of a liquid crystal display according to another exemplary embodiment of the present invention.

6 is a bottom perspective view of FIG. 5.

FIG. 7 is a cross-sectional view taken along the line BB ′ of FIG. 5.

<Description of the symbols for the main parts of the drawings>

1000: liquid crystal display

100: liquid crystal panel assembly

110: liquid crystal panel

111: thin film transistor display panel

112: common electrode display panel

120: drive IC

130: flexible printed circuit board

200: backlight unit

210: optical sheets

220: lamp assembly

230: upper storage container

231: coupling hole

240: light guide plate

250: reflective sheet

300: lower storage container

310: stepped portion for hook insertion

400: hook

410: splice protrusion

500: adhesive member

600: fixing member

The present invention relates to a display device, and more particularly to a liquid crystal display device.

Cathode ray tube (CRT), which is one of the display devices that are generally used, is mainly used for monitors such as televisions, measuring devices, information terminal devices, etc., but due to its own weight and size, It could not actively respond to the demand for miniaturization and weight reduction.

In order to replace the cathode ray tube, it has advantages such as small size, light weight, low power consumption, and the like, and a liquid crystal display device which displays information by using the electrical and optical properties of the liquid crystal injected into the liquid crystal panel has been actively developed. Recently, it plays a role as a flat panel display device. In general, the liquid crystal display device is a display device having low power consumption, light weight, and small volume. The liquid crystal display device has been widely applied to a wide range of industries, for example, the computer industry, the electronic industry, and the telecommunication industry due to such unique advantages. As a matter of fact, the liquid crystal display device having such an advantage is applied to various fields such as a display device of a portable computer, a monitor of a desktop computer, a monitor of a high-definition video device, and the like.

The liquid crystal display is largely divided into twisted nematic (TN) and super-twisted nematic (STN) methods, and due to the difference in driving method, an active matrix display method using a switching element and a TN liquid crystal and a passive matrix using STN liquid crystal There is a passive matrix display method.

The big difference between these two methods is that the active matrix display method is used for thin film transistor liquid crystal display (TFT-LCD), which uses a TFT as a switch to drive the LCD, and the passive matrix display method does not use a transistor. There is no need for complicated circuits in this regard. LCDs using TFTs are widely used in recent years with the spread of portable computers.

The liquid crystal panel assembly includes a liquid crystal panel in which two substrates, that is, a thin film transistor array panel and a color filter substrate are bonded to each other, and a liquid crystal material having anisotropic dielectric constant is injected therebetween, A driving IC mounted on the liquid crystal panel and applying a driving signal to a gate line and a data line, and a flexible printed circuit board for connecting a printed circuit board to transmit predetermined data and control signals to the driving IC. . The liquid crystal panel assembly is accommodated in a predetermined container together with the backlight assembly and various optical sheets to form a liquid crystal display device.

In the conventional liquid crystal display, the flexible printed circuit board is bent around a predetermined surface of the lower storage container, and the bent flexible printed circuit board is adhered to the lower storage container by a double-sided tape having strong adhesion.

However, when the flexible printed circuit board is fixed to the lower housing by using the double-sided tape as described above, when the ambient temperature increases, the characteristics of the double-sided tape change, causing the flexible printed circuit board to be lifted or pushed, which causes a defect. there is a problem.

In addition, since the adhesive strength of the double-sided tape is strong, it is not easy to separate the extruded flexible printed circuit board from the lower storage container, and there is a problem that the flexible printed circuit board is damaged when the separation occurs.

Therefore, there is a need for a method of fixing the flexible printed circuit board to reduce the defect of the flexible printed circuit board without lifting or pushing the flexible printed circuit board even when the ambient temperature changes, and to reduce the defect of the flexible printed circuit board during rework.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a liquid crystal display device in which a flexible printed circuit board is not lifted or pushed even by changes in ambient temperature, and the separation of the flexible printed circuit board is easy.

However, the technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel assembly displaying image information; a backlight unit providing light to the liquid crystal panel assembly; and sidewalls along edges of an upper surface thereof. The upper storage container is formed to accommodate the liquid crystal panel assembly and the backlight unit in the side wall, and at least one coupling hole that can be coupled to the hook in the side wall, and the step for inserting the hook into which the hook can be inserted At least one additional part is formed, and includes a lower housing container coupled to the upper housing container, a flexible printed circuit board bent along a predetermined surface of the upper housing container and a hook for fixing the flexible printed circuit board.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The liquid crystal display device used in the present invention includes a portable multimedia player (PMP), a personal digital assistant (PDA), a digital versatile disk (DVD) player, a cellular phone, and the like. Hereinafter, the liquid crystal display device of the present invention will be described using a cellular phone for convenience of explanation. However, the present invention is not limited thereto and includes the aforementioned liquid crystal display devices.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 2A illustrates a process in which a hook is coupled to a liquid crystal display device 1000 in which the liquid crystal panel assembly, the backlight unit, the upper housing 230, the reflective sheet 250, and the lower housing 300 of FIG. 1 are assembled. 2B is a perspective view of the liquid crystal display 1000 having the hooks coupled thereto, and FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2.

Referring to FIG. 1, the liquid crystal display 1000 according to the present invention as a whole includes an upper storage container 230 accommodating a liquid crystal panel assembly 100, a backlight unit, a liquid crystal panel assembly 130, and a backlight unit 200. , And a lower storage container 300 coupled to the upper storage container 230.

Herein, the liquid crystal panel assembly 100 includes a thin film transistor array panel 112 and a liquid crystal panel 110 including a common electrode display panel 111, a liquid crystal (not shown), a driving IC 120, and a flexible printed circuit board 130. And the like.

The liquid crystal panel 110 displays image information such as letters, numbers, and arbitrary icons by adjusting the transmittance of light passing through the liquid crystal layer (not shown) according to the intensity of the applied voltage. The liquid crystal (not shown) filled between the thin film transistor array panel 112 on which the TFT is formed, the common electrode panel 111 on which the color filter CF is formed, and the thin film transistor array panel 112 and the common electrode panel 111. It is composed of layers.

The thin film transistor array panel 112 includes a plurality of gate lines, data lines, and pixel electrodes. The gate lines extend in the row direction to carry the gate signal, and the data lines extend in the column direction and carry the data signal. The pixel is connected to the gate line and the data line and includes a switching element and a storage capacitor.

Here, the switching element is formed at the intersection of the gate line and the data line, and the sustain capacitor and the liquid crystal capacitor are connected to the output terminal of the switching element. In addition, the switching element is implemented as a thin film transistor having amorphous silicon and poly-silicon as a channel layer.

The other terminal of the holding capacitor is connected to a common voltage or to a gate line immediately above. Here, the former connection method is called a separate wire type, and the latter connection method is called a front gate type.

The common electrode display panel 111 is disposed on the thin film transistor array panel 112 and includes a red, green, or blue color filter in a region corresponding to the pixel electrode so that colors can be displayed for each pixel. The color filter may be formed above or below the pixel electrode. In addition, a common electrode made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the color filter.

The liquid crystal layer (not shown) is filled between the common electrode panel 111 and the thin film transistor array panel 112 and has a dielectric anisotropy. The liquid crystal layer (not shown) has a thickness of about 5 μm and has a twisted nematic (TN) arrangement. The alignment direction of the liquid crystal layer is changed by a voltage applied from the outside. In this way, the transmittance of light passing through the liquid crystal layer is controlled.

As described above, the thin film transistor array panel 112, the common electrode panel 111, and the liquid crystal layer constituting the liquid crystal panel 110 constitute a liquid crystal capacitor, and the liquid crystal capacitor configured as described above has a common voltage and an output terminal of the switching element. Or a reference voltage.

The driving IC 120 receives a gate control signal, a data control signal, and a related data signal from a printed circuit board (PCB) through an input terminal, and transmits the gate driving signal and the data driving signal through an output terminal. An integrated circuit for providing the gate line and the data line formed on the thin film transistor array panel 112, respectively. As a result, a desired image may be implemented on the liquid crystal panel 110.

The driving IC 120 is mounted on the thin film transistor array panel 112 outside the image display region corresponding to the common electrode display panel 111 of the thin film transistor array panel 112, and an output terminal thereof extends from the image display region. It is mounted by a COG (chip on glass) method so as to be connected to the gate line and the data line, respectively. Accordingly, as described above, the gate driving signal and the data driving signal generated by the driving IC 120 are transmitted to each pixel formed in the image display area of the thin film transistor array panel 112.

Flexible printed circuit board (FPCB) 110 is a type of printed circuit board (PCB) that connects various electronic components or supports the components according to the circuit design of the electrical wiring to the printed circuit board. Unlike conventional printed circuit boards, they are flexible.

The flexible printed circuit board 130 generally includes a base film, a terminal region having metal thin plate patterns arranged as lead terminals at both ends of the base film, and a terminal metal array pattern arranged at both ends of the base film to be connected to each other. And an interface region formed as a wiring and formed with a coverlay for protecting and insulating electrical wiring. In addition, a plurality of through holes may be formed in the interface region, and the electronic component mounted through the plurality of through holes may further include a region in which a predetermined electronic circuit is formed by being connected to an electrical wire.

One end of the flexible printed circuit board 130 formed as described above is connected to a printed circuit board (not shown), and the other end thereof is connected to an input terminal of the driving IC 120. Accordingly, the gate driving signal, the data driving signal, and the related data signal are transmitted from the printed circuit board to the driving IC 120.

When combined, the flexible printed circuit board 130 is bent around one wall of the upper receiving container 230 to meet one surface of the lower receiving container 300, as shown in FIG. 2A. The substrate 130 is fixed to the upper receiving container 230 by the hook 400 or the fixing member 600.

The back light unit BLU includes the optical sheets 210, the lamp assembly 220, the light guide plate 240, and the reflective sheet 250.

Here, the light guide plate 240 serves to guide the light emitted from the lamp assembly 220. The light guide plate 240 is formed of a panel of a plastic-based transparent material such as acryl to allow the light generated from the lamp assembly 220 to be directed toward the liquid crystal panel 110 seated on the light guide plate 240. Accordingly, various patterns for converting the traveling direction of light incident into the light guide plate 240 toward the liquid crystal panel 110 may be printed on the rear surface of the light guide plate 240.

The lamp assembly 220 is inserted into one side of the light guide plate 240 in the upper receiving container 230. As a lamp used in the lamp assembly 220, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like may be used.

The reflective sheet 250 is installed on the lower surface of the light guide plate 240 to reflect the light emitted to the bottom of the light guide plate 240 to the top. The reflective sheet 250 is disposed on the lower surface of the light guide plate 240, and reflects light, which is not reflected by the minute dot pattern on the rear surface of the light guide plate 240, toward the exit surface of the light guide plate 240. At the same time, it reduces the loss of the incident light and improves the uniformity of the light transmitted to the exit surface of the light guide plate 240.

The optical sheets 210 are mounted on the upper surface of the light guide plate 240 to diffuse and collect light transmitted from the light guide plate 240. The optical sheets 210 include a diffusion sheet, a prism sheet, a protective sheet, and the like.

A diffusion sheet located between the light guide plate 240 and the prism sheet disperses the light incident from the light guide plate 240 to prevent the light from being partially concentrated. The prism sheet has a triangular prism with a regular arrangement on the upper surface, and is usually composed of two sheets, and each prism array is arranged so as to cross each other at a predetermined angle, so that the light diffused from the diffusion sheet is a liquid crystal panel. Condensing in a direction perpendicular to the (110). As a result, the light passing through the prism sheet almost runs vertically so that the luminance distribution on the protective sheet is uniformly obtained. The protective sheet formed on the prism sheet not only serves to protect the surface of the prism sheet, but also serves to diffuse light in order to make the distribution of light uniform. In addition, a black line (not shown) may be formed along the edge of the protective sheet to prevent bright lines or light leakage generated at the edge of the display area of the liquid crystal panel 110.

Here, in the case of the small liquid crystal display 1000, a single lamp is usually installed on the side of the light guide plate 240, but as the liquid crystal display 1000 increases in size, a plurality of lamps may be provided in one lamp assembly 220. Lamps may be installed.

The liquid crystal panel assembly 100 is installed on the optical sheets 210 and is mounted in the light guide plate 240 together with the optical sheets 210.

The upper accommodating container 230 has sidewalls formed along the edge of the rectangular opening, and a predetermined locking protrusion (not shown) is formed in the sidewall to accommodate and fix the liquid crystal panel assembly 100 and the backlight unit. And prevents the plurality of sheets from bending. Here, the shape of the upper storage container 230 may be variously modified according to a method of accommodating the backlight unit or the liquid crystal panel assembly 130 in the upper storage container 230. In addition, the upper receiving container 230 according to an embodiment of the present invention is formed with at least one coupling hole 231 on the side wall. Coupling hole 231 is coupled to the hook 400 serves to fix the flexible printed circuit board 130 bent around the one side wall of the upper container 230 to the container. In this case, in order to closely fix the flexible printed circuit board 130, the coupling holes 231 may include at least two sidewalls, for example, two sidewalls facing each other. It is preferable to be formed as above.

On the other hand, a hook insertion step step portion 310 that can be coupled to the hook 400 is formed on the bottom surface of the lower storage container 300 coupled to the upper storage container 230. At this time, the hook insertion step 310 is formed at the same position as the coupling hole 231 of the upper receiving container (230). Here, the hook 400 may be implemented in a 'b' shape, as shown in Figure 1, in this case, the outer side of the hook 400 is coupled to the coupling hole 231 of the upper receiving container 230 Coupling protrusion 410 can be formed. As shown in FIG. 2A, the hook 400 is inserted into the hook insertion step 310 of the lower housing 300. As shown in FIG. 2B, the coupling protrusion 410 of the hook 400 is coupled to the coupling hole 231 of the upper storage container 230 to fix the flexible printed circuit board 130 to the storage container.

As such, the flexible printed circuit board 130 bent about one side wall of the upper storage container 230 may be fixed to the storage container by using the hook 400 and the adhesive member 500. 4 is a cross-sectional view of the liquid crystal display 1000 in which the flexible printed circuit board 130 is fixed to the storage container by the hook 400 and the adhesive member 500.

Referring to FIG. 4, an adhesive member 500, for example, a double-sided tape 500 is attached to an inner bottom surface of the hook 400. The flexible printed circuit board 130 is attached to the hook 400 to which the double-sided tape 500 is attached, and the hook 400 to which the flexible printed circuit board 130 is attached is a step for inserting the hook of the lower storage container 300. It is inserted into the part 310. The coupling protrusion 410 of the hook 400 inserted into the hook insertion step 310 is coupled to the coupling hole 231 of the upper storage container 230 to fix the flexible printed circuit board 130 to the storage container. . As such, when the adhesive member 500 is used, the adhesive member is formed only in the bottom area of the hook 400, thereby reducing damage to the flexible printed circuit board 130 even when the flexible printed circuit board 130 is separated. Can be.

Meanwhile, the flexible printed circuit board 130 may also be fixed to the storage container by using the fixing member 600. FIG. 5 is a perspective view of a liquid crystal display device 2000 in which the flexible printed circuit board 130 is fixed to a storage container by a fixing member 600. 6 is a bottom perspective view of the liquid crystal display 2000 shown in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line BB ′ of FIG. 5.

As shown in Figure 5, the fixing member 600 according to an embodiment of the present invention may be implemented in a '' 'shape. After the flexible printed circuit board 130 is bent, the fixing member 600 is coupled to the side wall of the upper storage container 230 to fix the flexible printed circuit board 130 to the storage container.

At this time, in order to fix the flexible printed circuit board 130 to the storage container, the inner height of the fixing member 600 is the same as the height of the side wall of the upper storage container 230, or the flexible printing on the side wall height of the upper storage container 230. It is preferable that the thickness of the circuit board 130 is smaller than the sum of the thicknesses.

The liquid crystal display according to the exemplary embodiment of the present invention described above may use a wedge type backlight assembly including a lamp assembly at one side of the light guide plate as an example, and both sides of the light guide plate having a flat plane. The same applies to a flat type backlight assembly having a lamp assembly.

In addition, in the above-described embodiment of the present invention, an edge type backlight assembly having a lamp on the side of the light guide plate has been described as an example, but has a structure in which a plurality of lamps are arranged on the bottom without the light guide plate. The same applies to the direct backlight assembly.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the liquid crystal display device according to the present invention, the flexible printed circuit board may not be lifted or pushed even when the ambient temperature changes, and the liquid crystal display device in which the flexible printed circuit board is easily separated can be provided.

Claims (6)

A liquid crystal panel assembly displaying image information; A backlight unit providing light to the liquid crystal panel assembly; An upper storage container having a sidewall formed along an edge of an upper surface thereof to accommodate the liquid crystal panel assembly and the backlight unit in the sidewall, and at least one coupling hole formed in the sidewall to engage with a hook; At least one hook insertion step into which the hook can be inserted, and a lower storage container coupled to the upper storage container; A flexible printed circuit board bent along a predetermined surface of the upper storage container; And And a hook for fixing the flexible printed circuit board. The method of claim 1, The hook has a 'b' shaped liquid crystal display device. The method of claim 2, And a coupling protrusion coupled to the coupling hole on an outer surface of the hook. The method of claim 3, wherein And an adhesive member attached to an outer bottom surface of the hook to fix the flexible printed circuit board. A liquid crystal panel assembly displaying image information; A backlight unit providing light to the liquid crystal panel assembly; An upper storage container having a sidewall formed along an edge of an upper surface thereof to accommodate the liquid crystal panel assembly and the backlight unit in the sidewall; A lower storage container coupled to the upper storage container; A flexible printed circuit board bent along a predetermined surface of the upper storage container; And And a fixing member for fixing the flexible printed circuit board. The method of claim 5, The fixing member has a '-' shape and the inner sidewall of the fixing member is coupled to the outer sidewall of the upper container.

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